Trace metal pyritization variability in response to mangrove soil aerobic and anaerobic oxidation processes

Machado, Wilson; Borrelli, Natalia Lorena; Ferreira, Tiago Osório; Marques, A. G. B.; Osterrieth, Margarita Luisa; Guizan, Cleverson

doi:10.1016/j.marpolbul.2013.11.016

Cited by 39 publications

(32 citation statements)

References 37 publications

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“…2 and Fig.3), which suggest possible remobilization of zinc within the sediments due to redox processes. Mangrove sediments can develop these gradients due to tidal water oscillations, diagenesis, rhizosphere reactions (e.g., O 2 inputs by the roots) and bioturbation (Clark et al, 1998;Marchand et al, 2006;Machado et al, 2014). In turn, zinc remobilization and significant changes in the Zn isotopic record in sediments due to plant uptake are not expected, since mangrove vegetation show low bioaccumulation of metals (Marchand et al, 2006;Lewis et al, 2011).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…During anoxic conditions (e.g, during high tides), Fe-oxyhydroxides are partially reduced and the insoluble iron and trace elements sulfides are formed, as driven by microbial activity (Huerta-Diaz and Morse, 1992; Andrade et al, 2012). In turn, insoluble sulfide phases are partly oxidized during oxic conditions (e.g, during low tides), resulting in the partial release of trace metals to pore water or in the immobilization of these elements in Fe-oxyhydroxides (Lacerda et al, 1993;Otte et al, 1995;Purnobasuki and Suzuki, 2005;Marchand et al, 2011;Zhou et al, 2011;Machado et al, 2014).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

et al. 2017

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The use of zinc isotopes to trace anthropogenic sources in coastal areas has been tested in this study. We determined the stable isotopic composition of zinc in sediment cores, suspended particulate matter (SPM) and rocks collected at the Sepetiba Bay (southeastern Brazil), an estuarine lagoon heavily impacted by metallurgic activities.These isotopic signatures were compared with those from willemite ore, which represent the main mineral refined by the major industrial source of zinc. The aim was to test if this tracer system enables to identify sources and sinks of anthropogenic zinc and to reconstruct the temporal and spatial evolution of zinc contamination. can be useful to improve environmental monitoring efforts in coastal systems.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

et al. 2017

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“…These processes could have contributed to the varied radiotracer removal rates between treatments. Trace metals usually present an affinity for (oxy)hydroxides, which retain metals under oxidizing conditions in mangrove sediments [6,10]. However, under reducing conditions, the metal-bearing sulphides can occur in coastal sediments, as reported for the study area [23,37], which may also retain the trace metals [1,38].…”

Section: Resultsmentioning

confidence: 69%

“…The role of mangrove systems as biogeochemical barriers for trace metals across the land-ocean interface is dependent on metal-sediment associations, which are affected by the affinity of these elements to sedimentary constituents such as organic matter, sulphides, clay minerals and metal oxides [1][2][3][4]. The mechanisms involved in determining the metal sorption by mangrove sediments can vary spatially and temporally in response to tidal flooding variability, plant cover, rhizosphere development, as well as sediment physical, chemical and mineralogical properties [5][6][7]. In addition, microbial activity affects the accumulation of metal-bearing compounds by driving redox processes, consuming organic matter and fuelling the production of diagenetic minerals [5,8], thereby influencing the chemical speciation of metals [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of biological activity on 65Zn and 109Cd removal from tidal water by chronically-polluted mangrove sediments

Sondermann

Suzuki

Machado

et al. 2018

J Radioanal Nucl Chem

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The biological activity influence on the mangrove sediment capacity to remove 65 Zn and 109 Cd from tidal water was evaluated in a site chronically polluted. Benthic Activity Indexes (BAI), corresponding to relative estimates of biological impact on radiotracer accumulation, were higher for 109 Cd (* 38%) than for 65 Zn (* 10%) in the top centimetre of sediment. However, BAI exceeded 96% for deeper sediment layers. This apparent decrease in radiotracer diffusion into deep sediments through biological activity inhibition is stronger than reported for much less polluted mangrove nearby, suggesting that benthic organisms tolerant of chronic metal pollution may affect metal sorption mechanisms.

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“…Coastal wetlands have pyrite as one of the most conspicuous soil constituents, formed through synergetic or diagenetic processes that depend on redox conditions (Berner 1982;Canfield and Berner 1987;Schippers and Jørgensen 2002;Nóbrega et al 2013;Machado et al 2014). It is inferred that the present study sites either have been or are under the influence of marine conditions consistent with the formation processes of this authigenic mineral.…”

Section: Fe Geochemistrymentioning

confidence: 74%

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

et al. 2015

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This work aimed to test the suitability of pyrite (FeS 2 ) as a proxy for reconstructing past marine environmental conditions along the semiarid coast of Brazil. Morphological description combined with physicochemical analyses including Fe partitioning were conducted for soil depth profiles (30 and 60 cm depths) at three sites in two contrasting lagoons of the state of Ceará: a suspected former lagoon that would have been transformed into a freshwater Blake^at a site vegetated by Juncus effusus (site P1), and another lagoon with connection to the sea at sites vegetated by J. effusus (site P2) or Portulaca oleracea (site P3). Soil samples were collected in September 2010. Site P3 had more reducing conditions, reaching Eh values of -132 mV in the surface layer (0-10 cm), whereas minimum values for the P1 and P2 sites were +219 and +85 mV, respectively. Lower pyritic Fe values were found at site P1, with a degree of pyritization (DOP) ranging from 10 to 13%. At sites P2 and P3, DOP ranged from 9 to 67% and from 55 to 72%, respectively. These results are consistent with an interruption of tidal channels by eolian dune migration inducing strong changes in the hydrodynamics and physicochemical characteristics (lower salinity, oxidizing conditions) of these sites, causing the dieback of suspected former mangroves and a succession to freshwater marshes with an intermediate salt marsh stage. Together with other physicochemical signatures, pyrite can evidently serve as a useful proxy in tracking environmental changes in such ecotones, with implications for coastal management.

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Trace metal pyritization variability in response to mangrove soil aerobic and anaerobic oxidation processes

Cited by 39 publications

References 37 publications

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

Tracing of anthropogenic zinc sources in coastal environments using stable isotope composition

Influence of biological activity on 65Zn and 109Cd removal from tidal water by chronically-polluted mangrove sediments

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

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